Enhanced photoelectrochemical effciency and stability using a conformal TiO2 film on a black silicon photoanode

被引：214
作者：
Yu, Yanhao [1 ]
Zhang, Zheng [2 ]
Yin, Xin [1 ]
Kvit, Alexander [3 ]
Liao, Qingliang [2 ]
Kang, Zhuo [2 ]
Yan, Xiaoqin [2 ]
Zhang, Yue [2 ,4 ]
Wang, Xudong [1 ]
机构：
[1] Univ Wisconsin Madison, Dept Mat Sci & Engn, Madison, WI 53706 USA
[2] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Dept Mat Phys, Beijing 100083, Peoples R China
[3] Univ Wisconsin Madison, Mat Sci Ctr, Madison, WI 53706 USA
[4] Univ Sci & Technol Beijing, Beijing Municipal Key Lab Adv Energy Mat & Techno, Beijing 100083, Peoples R China
来源：
NATURE ENERGY | 2017年 / 2卷 / 06期
基金：
中国国家自然科学基金;
关键词：
ATOMIC LAYER DEPOSITION; WATER OXIDATION; SOLAR-CELLS; EFFICIENT; PERFORMANCE; EVOLUTION; NANOSTRUCTURES; REDUCTION; DRIVEN; PASSIVATION;
D O I：
10.1038/nenergy.2017.45
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Black silicon (b-Si) is a surface-nanostructured Si with extremely efficient light absorption capability and is therefore of interest for solar energy conversion. However, intense charge recombination and low electrochemical stability limit the use of b-Si in photoelectrochemical solar-fuel production. Here we report that a conformal, ultrathin, amorphous TiO2 film deposited by low-temperature atomic layer deposition (ALD) on top of b-Si can simultaneously address both of these issues. Combined with a Co(OH)(2) thin film as the oxygen evolution catalyst, this b-Si/TiO2/Co(OH)(2) heterostructured photoanode was able to produce a saturated photocurrent density of 32.3mAcm(2) at an external potential of 1.48V versus reversible reference electrode (RHE) in 1M NaOH electrolyte. The enhanced photocurrent relative to planar Si and unprotected b-Si photoelectrodes was attributed to the enhanced charge separation effciency as a result of the effiective passivation of defective sites on the b-Si surface. The 8-nm ALD TiO2 layer extends the operational lifetime of b-Si from less than half an hour to four hours.
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页数：7
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